1 /* Check whether caller comes from the right place.
2 Copyright (C) 2004-2016 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <http://www.gnu.org/licenses/>. */
23 #include <gnu/lib-names.h>
28 _dl_check_caller (const void *caller
, enum allowmask mask
)
30 static const char expected1
[] = LIBC_SO
;
31 static const char expected2
[] = LIBDL_SO
;
33 static const char expected3
[] = LIBPTHREAD_SO
;
35 static const char expected4
[] = LD_SO
;
37 for (Lmid_t ns
= 0; ns
< GL(dl_nns
); ++ns
)
38 for (struct link_map
*l
= GL(dl_ns
)[ns
]._ns_loaded
; l
!= NULL
;
40 if (caller
>= (const void *) l
->l_map_start
41 && caller
< (const void *) l
->l_text_end
)
43 /* The address falls into this DSO's address range. Check the
45 if ((mask
& allow_libc
) && strcmp (expected1
, l
->l_name
) == 0)
47 if ((mask
& allow_libdl
) && strcmp (expected2
, l
->l_name
) == 0)
50 if ((mask
& allow_libpthread
) && strcmp (expected3
, l
->l_name
) == 0)
53 if ((mask
& allow_ldso
) && strcmp (expected4
, l
->l_name
) == 0)
56 struct libname_list
*runp
= l
->l_libname
;
60 if ((mask
& allow_libc
) && strcmp (expected1
, runp
->name
) == 0)
62 if ((mask
& allow_libdl
) && strcmp (expected2
, runp
->name
) == 0)
65 if ((mask
& allow_libpthread
)
66 && strcmp (expected3
, runp
->name
) == 0)
69 if ((mask
& allow_ldso
) && strcmp (expected4
, runp
->name
) == 0)
78 /* Maybe the dynamic linker is not yet on the list. */
79 if ((mask
& allow_ldso
) != 0
80 && caller
>= (const void *) GL(dl_rtld_map
).l_map_start
81 && caller
< (const void *) GL(dl_rtld_map
).l_text_end
)
84 /* No valid caller. */